Damper-



March 14, 1933. I J c F, SCHAFER ET L 1,901,125

' DAMPER" Filed Jan. 4, 1952 FlGvi [/7V6/7/0/15 JOHN C.r-. scrim-ER, & JOSEPH F'. BLESER/ forwqy Patented Mar. 14, 19 33 UNITED STATES PATENT oFFIcB JOHN o. r. semen, or ,MOUNT PULASKI, AND JOSEPH F.1BLESEB, or srRmerInL-n, ILLINOIS; SAID BLESER Assmnon To SAID scnnrnn DAMPER Application filed January 4, 1932. Serial No. 584,638.

Our invention relates to improvements in dampers, and more particularly to a damper having means thereon to .conveniently and accurately perforate a stove pipe in which .5 the damper is to be inserted, for the mounting of the damper therein in proper position.

The invention has among its objects, the

in" which the damper plate will straddle the end of the pipe when it is desired to perfo- 20 rate the latter to receive the damper rod, said plate having a threaded portion upon one of I the straddling legs so that the damper rod may be fed .therethrough, and the other ,leg is bent to either side of the plane of the plate and terminates above the threaded portion of the first leg, so as to form a good support to engage against the ,innersurface of the pipe while perforating the pipe.

Still further Objects of the invention are I the construction of the same wherein the'same 'will beneat in appearance, simple and sturdy in construction, compact, easy to operate either for the perforating'of the pipe-or when in normal use, reliable, and .eflicient and satisfactory for use wherever found applicable.

Other objects and advantages of the -con struction herein shown and described will be 40 obvious to those skilled in the art to which this invention appertains, from the disclosures herein given. a

In the drawing, wherein like reference characters indicate like or corresponding parts throughout the views,

Figure 1 is a ,plan View of the damper in normal use within astove pipe;

Figure 2 is aside elevation of thesame, .Wltllwthfi damper rod aboutto perforate the pipe; i v p Figure 3 is a perspective view of the damper plate, with the rod removed; and

Figure ,4 is a cross-sectional view, taken substantially along the line 44of Fig.3.

Referring more particularly to the .draw- -1;

ing, wherein we have illustrated the preterred embodiment of our invention, A indicates one end of a length of stove pipe, and generally made of sheet iron or the like and in which it is desired to place a damper for the usual purpose of controlling the passage of the smoke or gases therethrough.

The damper is indicated generally as B, and comprises a plate 1 of a shape to fit easily within the pipe A to substantially close the passage therethrough, and in the form shown is somewhat circular .in outline. The plate may be made in any desired manner, .a s by stamping, casting or the like, and may be fairly thin, as shown; 7

A transverse or diametral ly extending slit L 2 is provided in the plate, from the'periphery of the same to adjacent the opposite perlph-e eral point, to thereby form a pair'of legs 3 and 4 adapted to straddle one end of the pipe a. a A, when it is desired to perforate the pipe for the damper rod bearings, as will soon be set forth more clearly.

Across the-damper plate ina idiametral line normal to the direction of the slit 2 aredainpier rod supporting means, consisting of conca-vo-convexpa-irs of members 5 and 6 at either side of the slit, the members ofeach pair being curved oppositely to one another to form ,a circular bearing for the damper rod that is positioned therethrough when the latter is in its normal position, and in addit-ion,;the members of one pair have the notches .7 to accommodate the projections 8 carried by the damper rod, and to limit the longi- .1 t'udina l movementof the latter its hearings on the plate. v

. .The damper rod Rjmay be provided with means i'or grasping the same for proper m a- ,nipulationth'ereof when it is ,desired to oper-.

ate the damper, and this maybe done by offsetting the projecting end of the latter at an angle so as to provide the handle portion 9 A'coiled spring 10; may be interposed-between this handleportion and the stove pipe,

and permit further longitudinal movement of the rod and complete withdrawal of the latter from the plate.l v r The end of one of the legs, as for example the leg 4, is provided with a concavo-convex damper-rod receiving member 11, suitably provided with screw threads 12 therealong so as to threadedly receive the correspondingly threaded portion 13 ofthe damper rod and permit of the feeding of the rod therethrough 'asjthe rod is rotated therein. The damper rod is also sharpened or provided with a pointed end 14:, to perforate the pipe when fed through the member 11.

- In order to provide a firm support behind the wall of the pipe being perforated, the other leg 3 of the plate is formedwith an abutment at said slit 2, this abutment preferably being formed by bending the material of the plate outwardly from the plane of the plate as at 15, and thencer'moresharply bent to extend in the opposite direction'beyond the plane of the platefas at 16. Thusgthe abutment is so formed as to extend to both sidesof themedian plane of the plate at the slit and thus provide a good and full bearing to engage against the inner surface of the wall of the stove pipe, to permit of rapid and easy'perforating of the pipe from the exterior of said wall, as the. rodR is fed through the threaded guide means 11. It is also to be noted that the abutment-thus provided terminates above the axis through the member 11, and hence there is no likelihood of this abutment ever interfering with free passage of the rod through the pipe when perforating the latter. V When itis desiredto perforate the stove pipe in order to mount the damper within the pipe, the plate is placed so as to have the legs 3' and straddling the, end of the pipe,

and then the damper rod (which has been previously disengaged from its normal position' on the plate) is then screwed through the member 11, continued rotation of the rod feeding the same longitudinally to press the point into the pipe and drawing the abutment 151'6 firmly against the inner surface of the pipe substantiallyfthereat, and thenceproperly-perforatethe pipe. The plate is then movedto a diametrically opposite position to 7 again straddle the pipe, and a second perforation made in the same manner, through the stove-pipe, the perforations thus made'being necessarily made at the same distance below the top of the pipe and in the same plane, to assure perfect positioning of the damper rod within these aligned apertures to serve its normal function as an axle for the damper plate. t I r I Since the free end of the abutment terminates above the axis of the'member 11, an open space is thus always provided between said abutment and the opposed surface of the stove pipe to permit of some draft through the pipe even when the damper is fully closed, and hence there will be no excessive smoking caused by a fullclos'ure ofthe damper late,

this constantly open and unobstructed space being in addition to the space provided by the slit'2. I

Having thus describedour invention, it is obvious that various immaterial changes and modifications may be made in the same with- 3:85

out departing from thespirit "of our invention;'hence we do not wish to be understood as limiting ourselves to the exact form, arrangement, construction and combination herein shown and described, exceptas limited by thestate of the art to which this invention appertains, or the claims hereto appended.

'What we claim as'new and desire to secure by Letters Patentis:

1. A damper for a 'pipe, plate of substantially uniform thickness throughout and havinga slit extendinginwardly from the periphery to enable the plate to straddle said pipe; a pointedscrew-thread- Jed damperrod removably mounted on said plate; screw-threaded means on said plate at one side of said slit-to receive and guide the threaded rod during the perforating of the pipe; and an abutment formed from said plate on the opposite side of said slit and exg5105 tending to both sides of said plate to engage the interior wall of the pipe when the latter is straddled by said plate and said rodis rotatably fed insaid threaded guiding'means. M

2. A damper foruse within a pipe and comprising a plate having a 'diametral slit open at one end to form a pair of legs to straddlean end ofsa-id pipe; a threaded damper rod removably mountedon said plate and provided. with a pointed pipe-perforating end; a threaded damper rod support on one of saidlegs adjacent said slit and whose axis is in the median plane of the plate; and an abutment formed onthe' other leg of said plate by bending the latteralte'rnately to either side of the median plane of the plate .and which will abut the interior of said pipe when the plate straddles the latter and the rod is rotated within said threadedsupport.

3. A damper for a pipe, comprisinga disk havinga pair of legsspaced; apart byla slit,

so as to straddle one end of said pipe when perforating the latter; a damper rod detach ably mounted on said plate'and threaded and provided with a pointed end; a threaded rod comprising a 3795 guide on one ofsaid legs to receive said rod only when it is desired to perforate said pipe with the latter; and an abutment of uniform cross-sectional thickness with said plate and formed on the other leg of said plate by bending the same alternately to either side of the plate and terminating inwardly of the ends of said legs above said threaded guide, so that when the plate straddles the pipe and the rod is rotated within said threaded guide, said abutment will engage the interior Wall of the pipe beyond said rod While the pipe is pierced with said pointed end of the rod.

1 4. A damper for use within a pipe and comprising a plate having a diametral slit whereby the plate may straddle an end of said pipe, and with damper rod supporting means diametrally thereacross normal to said slit; a screw-threaded damper rod removably insertable in said means and provided with a pipe-perforating end; screwthreaded guide means on said plate adjacent the open end of said slit to receive said threaded rod when piercing the pipe; and

an abutment forming a permanent integral part of said damper and extending to either side of said plate at said slit to engage said interior of said pipe when the plate straddles the pipe and the rod is rotated Within said guide to feed against and perforate said pipe.

In testimony whereof, we have af'fixed our signatures.

JOHN C. F. SCHAFER.

JOSEPH F. BLESER. 

